<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript">
        var a=['a',1,false];

        for (i=0 ;i< a.length; i++){
            alert(a[i]);
        }
    </script>
</head>
<body>

</body>
</html>